High Quality Self Sealing Mailers100 % RECYCLABLE ( GO GREEN ) Self Sealing Poly Courier Shipping Mailers!Superior tear and puncture resistance.Just Peel-and-SealPressure sensitive adhesive provides a high strength durable closure, water and dirt resistantHigh-efficiency mailers are perfect for shipping a wide variety of non-fragile items.Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant. Water, Tear and Puncture resistant. High strength seams allow for over-stuffing.